Season 5 is airing now on CBS Thursdays. Season 6 is to air in 2018-19.
"Mom has been a lynchpin comedy for us over the last several years," Kelly Kahl, president of CBS Entertainment, said in a statement.
"It's a fearless series that tackles provocative social issues with laughter and grace, and a large, loyal audience has followed."
"With gifted talents like Anna and Allison leading a great ensemble cast, and a production team headed by Chuck Lorre, Eddie Gorodetsky, Nick Bakay and Gemma Baker, this series just keeps getting better."
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